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log-slow-queries="D:/mysql/slowlog"
long_query_time=0.01
log-queries-not-using-indexes

2.²éѯ½á¹û
|    5 | 10  | 2009-09-22 15:29:25 |
|    8 | 3    | 2009-09-21 14:30:06 |
|  10 | 2232 | 2009-09-22 14:27:21 |
|  11 | 2123 | 2009-09-22 14:27:25 |
|  12 | 34  | 2009-09-22 14:27:32 |
+------+------+---------------------+
19290 rows in set (0.08 sec)


SET global log_output=file

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SQL code:
mysql> show variables like 'long_query_time';
+-----------------+-----------+
| Variable_name | Value |
+-----------------+-----------+
| long_query_time | 10.000000 |
+-----------------+-----------+
1 row in set (0.06 sec)

mysql> show variables like '%slow%';
+---------------------+-------+
| Variable_name | Value |
+---------------------+-------+
| log_slow_queries | ON |
| slow_launch_time | 2 |
| slow_query_log | ON |
| slow_query_log_file | |
+---------------------+-------+
4 rows in set (0.00 sec)

mysql> show va


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